What mode are you trying to use them in- hybrid or standard midi? I take it if you only have Traktor Pro and not Traktor Scratch Pro that you are running them in standard midi mode? Are you wishing to use the x1600 in external or internal mode?
There are a couple of great threads on the Denon DJ forums on setting these up with Traktor Pro-
http://www.denondjforums.com/denonfo...023e69d54c55cb
http://www.denondjforums.com/denonfo...023e69d54c55cb
I assume you have the relevant Asio driver for the mixer and the TSi files for the 3900s already downloaded and installed?
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